The following is largely derived from the description of Jenkins (1986).
The cap of A. altifissura is 40 mm wide, plano-convex, white, dry,
deeply rimose-areolate, slightly appendiculate, with a nonstriate, incurved margin. The volva is present as
irregularly shaped, dark brown, thin crusts or patches on top of each areola, relatively firmly attached.
The gills are not crowded, adnexed, white to pale cream, and narrow. Short gills
are numerous, concavely to convexly truncate to subattenuate.
The stem is 20 × 8 - 11 mm, tapering upward, slightly expanded at the apex, solid, white, exannulate, without volval remnants. A turnip-shaped bulb is present at the base of the stem.
The spores measure (9.4-) 10.2 - 11.7 (12.5) × (5.0) 5.5 - 6.2 µm and are amyloid
and elongate to short cylindric. Clamps are present at bases of basidia.
Amanita altifissura is known from mixed forests in the southeastern U.S.
Jenkins originally described the present species from Alabama, U.S.A. and later reported it from North Carolina.
Placement of the present species with regard to the stirpes of Bas is unresolved.—R. E. Tulloss
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in herb. David T. Jenkins, Univ. of Alabama at Birmingham
The following text may make multiple use of each data field.
The field may contain magenta text presenting data from a type study
and/or revision of other original material cited in the protolog of the present taxon.
Macroscopic descriptions in magenta are a combination of data from the protolog and
additional observations made on the exiccata during revision of the cited original
The same field may also contain black text, which is data from a revision of the present
taxon (including non-type material and/or material not cited in the protolog).
Paragraphs of black text will be labeled if further subdivision of
this text is appropriate.
Olive text indicates a specimen that has not been
thoroughly examined (for example, for microscopic details) and marks other places in the text
where data is missing or uncertain.
The following text is derived from the protolog of the present species (Jenkins 1979a).
Each spore data set is intended to comprise a set of measurements from a single specimen made by a single observer;
and explanations prepared for this site talk about specimen-observer pairs associated with each data set.
Combining more data into a single data set is non-optimal because it obscures observer differences
(which may be valuable for instructional purposes, for example) and may obscure instances in which
a single collection inadvertently contains a mixture of taxa.